Some three or more decades ago, when I was a young'un visiting the Smokies with my parents and some of their friends, we came upon one of the "Oooo, look, bears!" crowds.
The crowd, including my father and his friends started throwing crab apples down to the bears... which the bears appreciatively ate, until the crab apples ran out. Then the bears wanted more, and started running toward the crowd. People can move fairly fast when they want to..
I've had several Smokies bear experiences. Back in college, while backpacking, I came upon a guy carrying a shredded backpack. About a half mile up the trail, he said, he'd encountered a bear who started running toward him. He dropped his backpack and took off. Bear stopped at the backpack, "opened" it, and removed the food. Bears know where the food is.
I ran into a couple bears, myself, on the Appalachian Trail in the Smokies. One night, while in one of the shelters along the trail, a bear came up and started shaking the chain link wire with which they covered the front of the shelters, and pawing the door. It finally went away.
On another occasion, I was approaching a shelter in the late afternoon, and noticed a bear pawing around a campfire circle in front of the shelter. I wasn't too comfortable just standing there..., so I hung my pack in a tree, and slowly edged up to the shelter (the bear was about 20 feet away), and jumped into the shelter and closed the chain link door. Only then did I think "Oh, great.., I've just trapped myself in a cage, with my backpack hanging in a tree for the bear to play with".
But he finally wandered off.
That night, we'd (myself and several other hikers who'd come in that night) just settled down to sleep when we heard some noises. A flashlight revealed a skunk in the shelter, rooting through some open canned food another hiker had brought into the shelter.., but that's another story
I heard, recently, the park service is removing the chain link fronts of those hiking shelters. That ought to make life interesting!